Surface passivation of chalcopyrite in bioleaching process
The surface passivation of the chalcopyrite bioleaching process with Acidithiobacillus ferrooridans at 30℃ was investigated using the electrochemical tests with surface analysis of electrodes and leaching residues by SEM/ EDX and XRD. The results of the electrochemical study showed that the dissolution of chalcopyrite involved many intermediate reactions and the changes in the electrochemical behavior of the electrode at different bioleaching times were evident. The anodic and cathodic current signals decreased with progress of the bioleaching and disappeared at a late stage of bioleaching showing passivation attributed to the formation a protective layer on the chalcopyrite surface. The surface analysis of the electrodes after electrochemical tests and leaching residues confirmed the formation of S and FeOOH in the bioleaching progress as well as a covering of the chalcopyrite surface by a large quantity jarosites in the latter period of bioleaching. Combining the results of the bioleaching experiment, it is indicated that jarosites were the principal cause of surface passivation and the low leaching rate of chalcopyrite.
chalcopyrite passivation film Acidithiobacillus ferrooridans electrochemistry bioleaching
Guohua Gu Keting Hu Yuwu Guo Guanzhou Qiu
School of Mineral Processing and Bioengineering, Central South University, 410083, Changsha, China Key Laboratory of Biometeorology, Ministry of Education, 410083, Changsha, China
国际会议
The 19th International Biohydrometallurgy Symposium(第19届国际生物湿法冶金大会 IBS2011)
长沙
英文
465-471
2011-09-18(万方平台首次上网日期,不代表论文的发表时间)